Indlela yokubala indawo kanxantathu?

Ngamanye amaxesha ebomini kukho iimeko xa kuyimfuneko lokuhlolisisa imemori ekufuneni ulwazi elide-ulibele esikolweni. Umzekelo, kuyimfuneko ukuba achaze indawo yomhlaba okanye kweza imilo ezingoonxantathu wokulungisa elilandelayo eflethini okanye kwindlu yabucala, kwaye kuyimfuneko ukuba ubale kanjani indaba ukuba ushiye umphezulu kunye imilo ngunxantathu. Kwakukho ixesha xa nako ukusombulula le iphazili kwimizuzu embalwa, kwaye ngoku ngamandla uzama ukukhumbula ukuba indlela indawo kanxantathu?

Akukho mfuneko ngenxa la mava! Ngapha koko ke, Kuyinto eqhelekileyo, xa ingqondo yomntu ugqiba ukuba bayeke ulwazi elide-elingasetyenziswanga naphi na egumbini elikude, ukusuka apho ke ngamanye amaxesha kangako lula. Ngoko ke musa ukuba ubunzima kunye ukufuna ulwazi ulibele isikolo ukusombulula le ngxaki, eli nqaku liqulathe iindlela ngeendlela ezenza kube lula ukufumana indawo efunekayo ye nxantathu.

Yinto eyaziwayo ukuba olu hlobo kanxantathu kuthiwa buyimilo, nto leyo kuphela inani elincinane kangangoko lamacala. Enyanisweni, nayiphi yepholigoni lungohlulwa lube oonxantathu, izihlanganisi eziphezulu ziqwempu yayo loo nto ukuwela kuye. Ngoko ke, ukwazi Ngokwefomyula yokubala indawo kanxantathu, unako ukubala ummandla wayo nayiphi na imilo.

Phakathi zonke oonxantathu kunokwenzeka ukuba kwenzeka ebomini, ezilandelayo iintlobo ezithile zezi: alinganayo, isosceles kunye ekunene-yomumo.

Indlela elula kummandla kanxantathu libalwa xa omnye engile yayo elungileyo, oko kukuthi, kwimeko apho unxantathu tye. Kulula ukuba uqaphele ukuba nguye isiqingatha uxande. Ngoko ke, endaweni elingana nesiqingatha imveliso zamaqela, leyo fomu phakathi kwabo esinekona sasekunene.

Ukuba siyazi ephakame lo nxantathu, bewuhlisele kwenye eziphezulu bayo kwelinye icala, kunye nobude ngapha, ekuthiwa isiseko, le ndawo ibalwa njengoko imveliso enesiqingatha, ukuphakama siseko. Kubhaliwe ngaye ifomula:

S = 1/2 * b * h, apho

S - indawo wacela nxantathu;

b, h -, ngokulandelelana, ukuphakama ubuvuvu lo nxantathu.

Ngoko lula ukubala indawo unxantathu isosceles, ekubeni ukuphakama wokwahlulwa icala wesiqingatha, kwaye oko kulinganiswa lula. Xa kumiselwa indawo kanxantathu ilungelo kwindawo ephakamileyo lula ukuthatha ubude omnye kumacala uyila esinekona sasekunene.

Konke oku kakade okulungileyo, kodwa ukuba bahlole ukuba omnye eliyi ilungelo unxantathu okanye hayi? Ukuba ubungakanani mzobo lethu lincinane, ungasebenzisa i engile kwesakhiwo, unxantathu umzobo, amakhadi okanye ezinye izinto kunye kwemilo yoxande.

Kodwa kuthekani ukuba siye onesiyilo yonxantathu zomhlaba? Kulo mzekelo, maluqhutywe ngolu hlobo: kubalwa ukusuka phezulu uza esinekona sasekunene kwelinye icala umgama multiple-3 (30 cm, 90 cm, 3 m), ngoxa kwelinye icala nogesi ngokwesahlulo kumgama elifanayo ezininzi ka-4 (40 cm, 160 cm, 4 m). Ngoku kufuneka balinganise umgama phakathi endpoints zezi amacandelo amabini. Ukuba wajika ixabiso 5 ngesondo (50 cm, 250 cm, 5 m), oko Kungaphikiswa ukuba engile emgceni.

Ukuba uyazi ubude nganye macala amathathu mzobo wethu, indawo unxantathu na kumiselwa usebenzisa ifomula nguHeron kaThixo. Ukuze ube ifomu elula ngakumbi, sebenzisa ixabiso elitsha, leyo kuthiwa semiperimeter. Yeyona udibaniso onke amacala kanxantathu wethu yahlulwe kubini. Emva kokuba kuthiwe semiperimeter, uyakwazi ukuqhubeka kummandla nokuzimisela ngokomgaqo wokubala:

S = SQRT (p (pa) (PB) (pc)), apho

SQRT - ingcambu;

p - value semiperimeter (p = (a + b + c) / 2);

a, b, c - kungqameko (emacaleni) lo nxantathu.

Kodwa kuthekani ukuba unxathathu une imilo rhoqo? Kukho iindlela ezimbini kunokwenzeka. Eyokuqala kubo kukuzama ukuba ayahlule umzobo ibe oonxantathu ezimbini ekunene kwelinye icala ngesiquphe, umdibaniso kwiindawo apho babala ngokwahlukeneyo zaza zafakwa kunye. Kungenjalo, ukuba engile eyaziwa phakathi kwamacala amabini kunye nobungakanani kula macala, sebenzisa ifomula:

S = 0.5 * ab * sinC, apho

a, b - ecaleni unxantathu;

c - angela phakathi kwezi macala.

Ityala lokugqibela yokwenza inqabile, kodwa kunjalo, ebomini yonke into kunokwenzeka, ngoko ifomula asiyi akufuneki ezinikwe apha ngentla. luck okulungileyo izibalo zakho!